tj, I'm probably in the minority here on this, but I haven't had any warpage problems with the stock rotors in the 5 or 6 years I've had the car. On the other hand, you probably wouldn't call my driving style that aggressive.
The bottom line is, what's your driving style? If you're not into the brakes hard and heavy, as in from high speeds to a stop in a real short time, I'd save my money and stick to the stock rotors.
However, if you do like to drive in a very "spirited" fashion, warpage does seem to be a problem.
